In isothermal spheroidizing process, the spheroidization and growth of the carbide formed in hot-deformed high-carbon chromium cast steel at high temperature were investigated. The results showed that the spheroidizing growth of carbide proceeds in such a way that the bigger carbide particles swallow the smaller ones, and the short rhabdoid carbides dissolve and are spheroidized by itself. When the samples were held at 720 ℃ for more than 3 h, the spheroidization is not obvious. The feature of the process is the size increment and the amount decrement of carbide particles. The empirical equation for growth rate of carbides was obtained. The volume fraction of carbides keeps constant. The growth process agrees well with Ostwald Ripening Law.
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